Browser automatically refreshes when going back to the site to see and copy the code?
Solution: disable your Smart Power Savers to avoid such problems. 

• Valid until December 12, 2019 only.
• P100 Off with P400 Minimum Spend
• Valid site-wide except on Digital Goods & Vouchers.
• For in-app purchase and for one time-use.
• Applicable on Orders to be Delivered via Integrated Couriers.
• For first 1000 New users only.